| ชื่อเรื่อง | : | Many-body density matrices for free fermions |
| นักวิจัย | : | Cheong, Siew Ann , Henley, Christopher L. |
| คำค้น | : | DRNTU::Science::Physics::Atomic physics::Solid state physics |
| หน่วยงาน | : | Nanyang Technological University, Singapore |
| ผู้ร่วมงาน | : | - |
| ปีพิมพ์ | : | 2547 |
| อ้างอิง | : | Cheong, S. A., & Henley, C. L. (2004). Many-body density matrices for free fermions. Physical Review B, 69(7), 1-12. , 0163-1829 , http://hdl.handle.net/10220/4593 , http://dx.doi.org/10.1103/PhysRevB.69.075111 |
| ที่มา | : | - |
| ความเชี่ยวชาญ | : | - |
| ความสัมพันธ์ | : | Physical review B |
| ขอบเขตของเนื้อหา | : | - |
| บทคัดย่อ/คำอธิบาย | : | Building upon an analytical technique introduced by Chung and Peschel [Phys. Rev. B 64, 064412 (2001)], we calculated the many-body density matrix ρB of a finite block of B sites within an infinite system of free spinless fermions in arbitrary dimensions. In terms of the block Green function matrix G (whose elements are Gīj=〈ci†cj〉, where ci† and cj are fermion creation and annihilation operators acting on sites i and j within the block, respectively), the density matrix can be written as ρB=det(1-G)exp(∑ij[ln G(1-G)-1]ijci†cj). Our results suggest that Hilbert space truncation schemes should retain the states created by a subset of the ci†’s (in any combination), rather than selecting eigenvectors of ρB independently based on the eigenvalue. |
| บรรณานุกรม | : |
Cheong, Siew Ann , Henley, Christopher L. . (2547). Many-body density matrices for free fermions.
กรุงเทพมหานคร : Nanyang Technological University, Singapore. Cheong, Siew Ann , Henley, Christopher L. . 2547. "Many-body density matrices for free fermions".
กรุงเทพมหานคร : Nanyang Technological University, Singapore. Cheong, Siew Ann , Henley, Christopher L. . "Many-body density matrices for free fermions."
กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2547. Print. Cheong, Siew Ann , Henley, Christopher L. . Many-body density matrices for free fermions. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2547.
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